Drilling and tapping machine



A. C. PLETZ. I

nmums AND TAPPING MACHINE.

APPLICATION FILED MAY 2,1917- I Patented June 24, 1919.

2 SHEETS-SHEET l- A. 0. PLETZ.

DRILLING AND TAPPING MACHINE. APPLICATION HLEDMAY 2. 1911.

' Patented June 24, 1919.-

2 SHEETS-SHEET 2- lzz venl fat M C- the gear-casing,

i ni TED STATES PATENT orricn ARTHUR PLE'IZ, OF CINCINNATI, OHIO.

DRILLING- AND TAPPING MACHINE.

To all whom it may concern:

Be it known that 1,.Anrnun C. PLETZ, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented new and useful improvements in Drillin and Tapping Machines, of which the following is a specification.

My invention relates to drilling and tapping machines; its object being to improve the same with respect to efiiciency and convenience of operation; to which end the invention consists, generally, in the provision of means for controlling and regulating the vertical movement of the spindle whereby its action and the action of the cutting or boring tools is rendered more eflicient and the work producedmore exact and varied as desired to any pitch of thread cutting; also in the provision and character of means employed to govern the action of the machine automatically and also, by hand control at any point, all as hereinafter more fully set forth. I

Drawings are attached hereto illustrating my invention in the best form in which I have contemplated the application of its principles, and the specification which follows refers to said drawing by letters of reference. In the drawing- Figure 1 (Sheet 1) is a side elevation of a portion of a drilling machine showing my improvements Fig. 2 (Sheet 2) is an elevation of same from the opposite view point, sectioned vertically through the gear casing; and

Fig. 3 (Sheet 2) is a plan section through driving mechanism.

Referring-now to the drawings, the sup porting frame 1, is provided with suitable bearings for a countershaft, 2, carrying usual set, 3, of cone ulleys, for transmitting driving power to the spindle, 4, which is carried vertically in bearings in which it rotates and has vertical motion in relation to a-table or platen (not shown) below-all as is usual.

The rotation of the spindle, 4, is immediately effected in alternate directions by miter-gear, 6, fixed on shaft, 2, engaging, above and below, corresponding miter-gears, 7, 8, running loose upon the spindle 4:.

Between the gears '7, 8, and splined upon at the spindle,,4, is a sleeve clutch, 5, adapted Specification of Letters Patent.

showing the clutch and.

Patented June 24, 1919.

7 Application filed May 2, 1917. Serial No. 165,931.

to engage with the gears 7 or 8 alternately upon being moved up or down by a bifurcated fork, 9, operating in a circumferential groove of the clutch-sleeve in the usual manner. The fork 9 is rigidly mounted on a cross rock-shaft, 10, journaled in the side walls of a casing, 11.. inclosing the gears and clutch, and the clutch isnormally held in its lowest or reversing position in engagement with the gear 8, by a spring, 12, coiled about the rock shaft, 10, with its fixed 116131111131, seated in the casing. The rock-shaft is extended outwardly through one side of the casing and there provided with a crank handle, 13, to throw the fork, 9, upward and raise the clutch into engagement with the upper gear, 7.

To regulate and insure the vertical movement of the spindle, 4, I attach to the latter a controlling device or pattern-sleeve, 1i, exteriorly threaded to the desired pitch and removably fastened to the spindle and rotating with it. Adjacentthereto erected upon the casing is a post or standard, 15,

parallel with the spindle and carrying a 'gallows-arm, 16, formed with a nut, 17, embracing the pattern sleeve, 14, with corresponding threads. By this construction, as will be obvious, the pitch of the threads in the tap produced by the cutting tool at the lower end of the spindle will accord with those of the sleeve, 14:, and its nut, 17. The pattern sleeve, 14, being removable, one with difierent pitch may be at any time substituted with assurance of entire accuracy in the work produced, and threads may be cut with a single pointed tool with like results.

To produce automatic operation, I employ a trip rod, 18 (Fig. 1) pivotally connected below to a sleeve, 19, rotatably embracing the spindle, 1, being itself nonrotatable but movable up and down with the spindle. The trip-rod extends upwardly through the perforated ends of a clutch catch 20, and trip-trigger, 21. The two latter elements are located at the outer side of the casing, 11;-the clutch-catch being rigidly secured upon the projecting extremity of the rockshaft, 10, and extended forward to embrace the trip-rod 18. The trip-trigger, 21, is arranged immediately above the catch, 20, and is carried upon 'a pivot stud, 22, secured in the wall of the casing. The trip-trigger, 21, is extended forward to embracethe trip rod, 18, as does 7 upon the trip rod, 18.

The rear end of the trip trigger, 21, nor-- mally rides upon the peripheral face of a disk, 2&, adjacent to the hand lever, 13,

seated on the rockshaft, 10; but by depressing the lever 13thns partially rotating the disk and lifting the clutch, against. the force of the spring 12, to its upper engagement with the driving gears-the rear end of the trigger drops into a segmental depression in the disk periphery and abuts against the radial wall thereof, and locks the parts in the forward or downward feed motion of the spindle. The force of the spring, 23, constantly tends thus to seat the trigger and hold it in locking position against the normal tendency of spring 23 to move the'clutch to the lower position of engagement, when permitted by the rotative position of the disk. Cooperating with these'are two stops or collars, 25, 26, secured adjustably upon the triprod, 18, respectively clutch-catch and trigger parts, and, by con tact with these parts through the described connections, effect the raising or lowering of the clutch, 5, in relation to the driving gears, and connects them alternately with the spindle, 4.

, This movement is effected by hand, when desired, by a hand lever, 27, pivotally hung upon the frame, 1, by a pendulum, 28, and operating the trip rod by its connection upon the stud, 29, which secures the trip' rod to the lower sleeve, 19, of the spindle. The lever, 27, is eounterweighted to balance the trip-rod and associated. parts.

The mode of operation may be summarized as follows: When the spindle, 4:, is running forward and feeding down, the

' upper trip-collar 25,'ultimately comes in contact with the trip-trigger 21, disengaging it from the clutch-catch, 20, and allows the spring, 23, to throw the clutch-fork, 9, into the reverse position and reverse the spindle motion, thus feeding the tap out of the work on the platen. Both the spindle and trip rod now feed upward. The lower trip collar, 26, is so set as to lift the clutch-catch, 20, and by its connection with the clutch-fork,

work is removed, another piece above and below the 9. the latter disengages the clutch, 5, and stops the motion of the spindle. The tapped is put in place on the platen, and by pressing down the handle, 13, the clutch is engaged with the upper or forward gear, 7, which again puts the spindle into forward (downward) motion and the described operation is repeated.

. I claim as my invention and desire to secure by Letters Patent of the United States:

1. In a drilling and tapping machine, a

vertically movable spindle; a vertically movable clutch splined thereon; oppositely driven gears loosely centered on said spindle and adapted to be engaged and rotated alternately by said clutch; a threaded sleeve or leader removably secured to said spindle; a fixed post secured to the frame adjacent to and parallel with said spindle; and a hollow matrixor nut threaded to engage said sleeve or'leader, and having a lateral arm adapted to embrace and be adjustably secured to said post.

2. In a drilling or tapping machine, a casing embracing the spindle (in part) with reversing gears and an intervening adjustable clutch, operated by a fork; a spring upon the fork-shaft normally holding it in lowest position; an external crank--ar1n on said shaft extending substantially parallel with the fork "and provided with. a disk or collar having a peripheral abuuncnt, a trip-arm pivoted to the casing substantially parallel with the crank-arm and resting at one end upon the disk, a trip-rod parallel with and connected at one end to the spindle and partaking of its longitudinal movement and extending at the other through the said crank arm and said triparm; a spring upon said trip-rod between and bearing against said arms, and adjustable stops secured upon said trip-rod above and below said arms.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit- ARTHUR C. PLETZ.

Witnesses:

WILLIAM P. HOHMANN,

ALICE L. TILDESLEY. 

